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I am trying to compare the third number to the last number and the fourth number to the fifth number. The if statement isn't running at all any help would be appreciated.
import java.util.*;
class Problem2{
public static void main (String[] args){
Scanner s = new Scanner(System.in);
System.out.println("Enter a number between 100000 and 999996: ");
int m = s.nextInt();
if(m < 100000 || m > 999996){
System.out.println("Out of range!");
}
else{
String j = Integer.toString(m);
for(int i=2;i<6,i++){
System.out.println(j.charAt(i));
if(j.charAt(i) == (j.charAt(i)+3)&& (j.charAt(i)+1) == (j.charAt(i)+2)){
System.out.println("Works!");
}
}
}
}
}
You are incrementing the value, not the index of the character.
Change this:
if (j.charAt(i) == (j.charAt(i)+3)&& (j.charAt(i)+1) == (j.charAt(i)+2))
To this:
if (j.charAt(i) == j.charAt(i+3) && j.charAt(i+1) == j.charAt(i+2))
// increment indexes --^ --^ --^
Move the additions inside of the charAt() calls.
if(j.charAt(i) == (j.charAt(i+3))&& (j.charAt(i+1)) == (j.charAt(i+2)))
Related
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I'm trying to delete the user integer input from an array. However, I can't get the value of the input.
while(keepGoing)
{
while (!scan.hasNextInt() )
{
scan.next();
System.out.print('\n'+"Choose a valid number: ");
}
int unitA = scan.nextInt();
if (unitA < 1)
{
System.out.print('\n'+"Choose one of the options: ");
keepGoing = true;
}
else if (unitA > 14)
{
System.out.print('\n'+"Choose one of the options: ");
keepGoing = true;
}
else
lengthValue.remove(unitA);
scan.close();
keepGoing = false;
}
//lengthValue.remove(int unitA);
System.out.println(unitA);
In my opinion, you forget to press "Enter" after entering input. A scanner can read the input if only you press the "Enter" key. Your solution seems correct to me. I was able to properly run it on my PC.
You can find a similar question here:
How to use Scanner to accept only valid int as input
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Closed 5 years ago.
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The purpose of my code is to enter a pin, and it'll check if it's right or not. If it isn't, the question will loop.
For some reason, my code doesn't loop properly, and a lot of the code is underlined. Specifically the while loop itself and the second JOptionPane
// package loop;
import javax.swing.JOptionPane;
public class loop {
public static void main(String[] args) {
int correctPin = 3333;
int count = 0;
String maybePin = JOptionPane.showInputDialog("Please enter the PIN");
int sMaybePin = Integer.parseInt(maybePin);
while(correctPin != sMaybePin);{
maybePin = JOptionPane.showInputDialog("Please enter the PIN");
count = count-1;
}
JOptionPane.showMessageDialog(null, count);
}
}
while(correctPin != sMaybePin); <--
Look at that ; that terminates the loop right there. You need to remove that.
You never update sMabyPin which is the variable you are checking against. If you do what #John and #ANS suggested you'll be stuck in an infinite loop.
Remove the ; after the while statement and correct set the value of the variable sMaybePin to the input vlaue and ot works
public static void main(String[] args) {
int correctPin = 3333;
int count = 0;
String maybePin = JOptionPane.showInputDialog("Please enter the PIN");
int sMaybePin = Integer.parseInt(maybePin);
while(correctPin != sMaybePin){
sMaybePin = Integer.parseInt(JOptionPane.showInputDialog("Please enter the PIN"));
count = count-1;
}
JOptionPane.showMessageDialog(null, count);
}
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Closed 6 years ago.
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I am trying to calculate the factorial of the integer user inputs, but it does not return anything. Why?
Thanks.
import java.util.Scanner;
`class App {
public static int factorial(int n) {
if (n == 0) {
return 1;
} else {
int recurse = factorial(n - 1);
int result = n * recurse;
return result;
}
}
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter an integer to calculate its factorial: ");
int users = input.nextInt();
factorial(users);
}
}
The problem in your code is that you are have not giving a print statement for displaying factorial of the number entered. Just returning a value will not print it. If you are working in BlueJ environment, you can only use the code by directly executing the method factorial. Thank You.
The problem in your code is that , you are have not given a print statement for >displaying factorial of the number entered.
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Closed 6 years ago.
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import java.util.Scanner;
public class lettercounter {
public static void main(String[] args) {
Scanner lettercounter = new Scanner(System.in);
System.out.println("Enter your sentence > ");
String sentence = lettercounter.nextLine();
int length = sentence.length();
System.out.println("what letter do you seek? > ");
String letters = lettercounter.nextLine();
char letter = letters.charAt(0);
int counter = 0;
for (int i = 0; i < length + 1; i++) {
char digit = sentence.charAt(i);
if (Character.toString(digit).matches(Character.toString(letter))) {
counter++;
}
}
System.out.println("Number of '" + letter + "'s found >" + counter + "");
}
}
whats wrong with the code?? i tried doing this but there seems to be an error when i run it: it says
xception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 4
at java.lang.String.charAt(Unknown Source)
at lettercounter.main(lettercounter.java:15)
i<length+1 should be i<length.
This fixes the problem because there are only length characters in the string, accessible via sentence.charAt(0) up to sentence.charAt(length - 1). You are trying to access one more character - sentence.charAt(length).
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Closed 7 years ago.
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The following code compiles, but when I ran it, it didn't enter the while-loop. Why ?
while (Str1.equals(Str2)); {
count = 1;
while (count <= maxCount); {
System.out.print(something1);
count = count + 1; } }
Remove the semi colon, semicolon is added only for do-while.Here is your code:
while (Str1.equals(Str2))
{
count = 1;
while (count <= maxCount)
{
System.out.print(something1);
count = count + 1;
}
}